and that's what robert brown saw in his microscope. he saw little particles, big enough to see, jiggle. why jiggling? small enough, there could be more atoms on one side than the other. little bit more neck force on one side of the atom... that thing will jiggle around. so in response to the jiggling atoms, boom, the visible observation: microscopic particles moving, brownian motion. turned out albert einstein explained that and that was one of the first contributions of einstein to prove the existence of atoms. he showed that the motion of those little particles of dust corresponded exactly to the motion of atoms at various temperatures. i asked you before, atoms big or small and you guys said... very small. small, right? okay, how small? small-small. small-small-small-small-small- small-small. how big is the sun? - big. - how big? very big. big-big-big-big-big-big. okay, let me tell you this, gang. the atom is small-small-small-small, as many times small than us as the sun and average-size stars are bigger than us. so do you want som